I have a JnJ Trains B&O I12 caboose kit that I picked up from ebay a few years ago. I've been afraid to try and build it out of fear of ruining it...
They were painted unique on each side to effectively double the number of I-12 cabooses on the layout. Some are minor changes but one is weathered...
My caboose paired up with the two that I painted for Brian DeVries
B&O/C&O cabooses at the Greater Cincinnati Railway Museum